Brake drum



June 13, 1939. c w S L 2,161,904

BRAKE DRUM Filed Aug. 3, 1931 3 Sheets-Sheet 1 INVENTOR ATTORN EY June 13, 1939. c. w, smc AlR 2,161,904

BRAKE DRUM Filed Aug. 3, 1931 3 Sheets-Sheet 2 ATTORN EYS June 13, 1939. c. w. SINCLAIR 2,161,904

BRAKE DRUM Filed Aug. 5, 1931 3 Sheets-Sheet I5 INVENTOR ATTORNEYJ Patented June 13, 1939 BRAKE DRUM Charles W. Sinclair, Detroit, Mich., assignor, by

mesne assignments, to The Kelsey-Hayes Wheel Company, Detroit, Mich, a corporation of Del aware Application August 3, 1931, Serial No. 554,810

9 Claims.

The invention relates to brake drums and has is adapted to sleeve over the barrel of the inner for an object to so construct a brake drum that it is eflicient in operation 'and may be made at relatively low cost. Another object is to so construct a brake drum that its web and annular brake engaging member may be made of different materials and efi'ectively secured together. Fur-- taken in connection with the accompanying drawings, in which:

Figure l is an elevation of a brake drum showing an embodiment of my invention;

Figures 2 and 3 are cross sections, respectively,

on the lines 22 and 3-3 of Figure 1;

Figure 4 is a view similar to Figure 1 showing another embodiment of my invention;

Figure 5 is a cross section on the line 5-5 of Figure 4;

Figure 6 is a view similar to Figure 1 showing another embodiment of my invention;

Figure 7 is a cross section on the line l-i of Figure 6;

Figure 8 is a view similar to Figure 1, showing another embodiment of my invention;

Figures 9, 10 and 11 are views similar to Figure 2 showing other embodiments of my invention;

Figure 12 is a view similar to Figure 1, showing another embodiment of my invention;

Figure 13 is a cross section on the line I3-l3 of Figure 12;

Figure 14 is a cross section on the line ll-ll 4c of Figure 13;

Figure 15 is a view similar to Figure 13, showing another embodiment of my invention;

Figure 16 is a cross section on the line 16- of Figure 15.

The brake drum shown in Figures 1 and 2 comprises the spoked web I and the annular brake engaging member 2. The spoked web is preferably formed of sheet metal and has the annular portion 3 which is provided with the annular series of holes 4 for receiving suitable means, such as bolts, to secure the brake drum to the radially extending fixed flange 5 of the inner hub 5. The annular portion 3 is laterally oflset forwardly or in a direction away from the flange 5 at l and has a central annular flange 8 which hub. The spoked web has the spoke portions 9 which radiate outwardly from the annular portion 3 and are preferably inclined outwardly and rearwardly therefrom and terminate in the radi- 5 ally extending anchoring portions III, which are surface 13 and with the ribs II on its radially outward (or external) surface and is cast upon 50 the peripheral anchoring portion or, more specifically, the anchoring portions ill at the outer ends of the spoke portions, it having the radially inwardly extending portion 15 embracing the anchoring portions and provided with integral porg5 tions l8 extending through the apertures H.

The radially inwardly extending portion ii of the brake engaging member is at one end of the brake engaging member and axially beyond the brake engaging or braking surface i3. Since the 30 peripheral anchoring portion of the web extends generally radially and is completely embedded in the end portion including the radially inwardly extending portion of the brake engaging member, the anchoring portion is spaced from the 35 brake engaging or braking sin-face to prevent chilling of the latter during the casting of the brake engaging member on the web. As a result, the brake engaging or braking surface may be readily machined and the weight of the brake 4o engaging member consistent with the necessary strength to safely take care of the stresses to which it may be subjected in operation may be reduced. Also, since the anchoring portion of the web does not extend over the brake engag- 45 ing or braking surface, the weight of the web may be reduced and furthermore the web does not interfere with the conduction of heat to the radially outer or external surface of the brake engaging member or radiation of heat from this 50 surface.

In the modification shown in Figures 4 and 5 the parts have the same general arrangement as those shown in Figures 1, 2 and 3, with the exception that the spoke portions l'l are provided 5 serve to induces flow of air through the brake drum upon rotation thereof to thereby assist in 1 metal spokes II in the same manner as shown cooling the brake drum.

Figures 63nd 7 disclose another embodiment of my invention in which the web of the brake drum is made of the separately formed sheet metal spokes II which radiate from a common center. Each of these spokes has at its outer end the apertured anchoring portion 2! which is formed in the same manner as the anchoring portion II and has intermediate itsends the hole 21 which with the other holes of the other spokes forms an annular series of holes corrsponding to the holes 4. Furthermore, each spoke has the transverse reinforcing flanges 24 corresponding to the reinforcing flanges l2 and, in addition, has the transverse rearwardly extending reinforcing flanges 25 upon the offset inner portion 26 of the spoke and extending between the barrel and radial flange of the inner huh. The portions of the spokes between the flanges I4 and -25 and contacting with the inner hub flange 5 are flattened out and of greater width than the portions at either end thereof. To provide greater strength and rigidity the adjacent portions of 1 the inner ends of the spokes are preferably weided together at 21. I

In the modification shown in Figure 8, the spoked web is made of separately formed sheet in Figures 6 and 7., with the exception that each of the spokes II has the reinforcing flanges 2! extending in opposite driections and corresponding to the reinforcing flanges 20, shown in Figure 5, to effect a flow of air through the brake and embraces the same and has integral portions extending through the apertures thereof.

vFigure 10 discloses another modiflcation in which the peripheral anchoring portion 34, which is formed by the anchoring portions at the outer ends of e spoke portions, is return bent and has its lls spaced from each other and apertured at I. The annular brake engaging member 3i iscast upon this peripheral anchoring portion and embraces the same and has integral portions extending between the side walls and through the apertures of these side walls.

In the modiflcationshown in Figure 11, the pe-, ripheral anchoring portion 31, which is formed by the anchoring portions at the outer ends of the spoke portions, is fixedly secured to the radially inwardly extending annular flange a of the brake engaging member I! by welds ll. The web-of the brake drum may be a spoked web, such as shown in Figures 1 or 4, ,butis preferably formed of spokes similar in-construction to those aroma andisweldedtotheouterendsofthespokesby the welds 41.

1"igures15 and 16 disclose still another modiflcation in which the annular brake engaging member 48 is cast upon theouter ends of the spokes is, which latter are U-shaped or sanicircular in ably provid with the transverse openings II which are fllled by the projections II integral with the portions of the brake engaging member extending within the outer ends of the spokes.

What I claim as my invention is:

1. A brake drum, comprising a web having spoke portions with oppositely extending transverse flanges projecting axially of the drum from the side edges of the spokes and anchoring portions at their outer ends; and an annular brake engaging member fixedly secured to said .anchoring portions and caried bysaid web.

2. A brake drum, comprising radiating spokes having anchoring portions at their outer. ends and oppositely extending transverse flanges projecting axially of the drum from the side edges of tion. These outer ends 7 Preferouter ends, certain of'said spokes having holes intermediate their ends, an annular brake engaging member flxedly secured to said anchoring portions and having portions extendingwithin the holes, said member being carried by said spokes, and means upon said spokes for creating a flow of air through the, brake drum uponrotation thereof.

4. A brake drum, comprising radiating sheet metal spokes having anchoring portions at their outer ends, holes intermediate their ends, reinforcing flanges at their edges radially outwardly having a generally radially extending peripheral I anchoring portion and an annular cast brake engaging member having an exposed heat radiating external surface and an internal braking surface, said brake engaging member having an end portion axially beyond said braking surface completely embedding said peripheral anchoring portion.

6. A brake drum comprising a sheet metal web having a generally radially extending peripheral anchoring portion and an annular cast brake engaging member having an exposed heat radiating external surface and an internal braking sur- 1 face, said brake engaging member having an end portion completely embedding said peripheral anend portion axially beyond said braking surface completely embedding said peripheral anchoring portion, said end portion including a radially inwardly extending portion of greater thickness than the minimum thickness of said brake engaging member.

8. A brake drum comprising a sheet metal web member having a generally radially extending peripheral anchoring portion formed with openings and an annular cast brake engaging member having an exposed heat radiating external surface and an internal braking surface, said brake engaging member having an end portion axially beyond said braking surface completely embedding said peripheral anchoring portion and extending through the openings thereof.

9. A brake drum comprising a sheet metal web member having a generally radially extending peripheral anchoring portion formed with openings and an annular cast brake engaging member having an exposed heat radiating external surface and an internal braking surface, said brake engaging member having an end portion comprising that portion axially beyond said braking surface and including that portion adjacent the zone of the axial extension of said braking surface completely embedding said peripheral anchoring portion and extending through the openings thereof.

CHARLES W. SINCLAIR, 

